Ball bearing
Needle roller bearing
Thrust bearing
Tapered thrust bearing
A lot of teams have tried to use needle rollers for their weapons in the past, and we've found that there's often enough play in the needles that, when your weapon is pulled by a belt or pushed by a gear, your weapon will go off-axis. For that reason, ball bearings and thrust bearings are kind of a match made in heaven if you're doing something like Liberator.
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